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Groundsmaster 5900/5910 Hydraulic SystemPage 4 -- 49
Procedure for Counterbalance Pressure Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
3. Connect a 1000 PSI (70 Bar) pressure gauge to test
port G1 on lift control manifold (Fig. 31).
4. After installing pressure gauge, start engine and run
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
5. Operate the engine at full engine speed (2750 RPM)
with no load on the system. Do not engage the cutting
decks.
GAUGE READING TO BE:
360 to 380 PSI (24.9 to 26.2 bar).
6. Stop engine and record test results.
7. If necessary,adjust the counterbalance valve so that
pressure is correct (see Adjustable Pressure Valve in
the Adjustments section of this chapter). The counter-
balance valve is locatedon the rear sideofthe lift control
manifold (Fig. 31).
8. Disconnect pressure gauge from test port.
1. Counterbalance test port 2. Counterbalance valve
Figure 31
1
2
Hydraulic
System